When Picard accepts Worf's offer to become his cha'DIch, Picard accepts by speaking in Klingon, then translates it into English. Who is he translating it for, exactly? Not Worf, not himself... it's as if he thinks somebody is watching or something!

It's a minor thing, but Picard orders the ship to head for "the first city of the Klingon Imperial Empire." Isn't "Imperial Empire" rather redundant?

Kahlest declared that "Mogh was loyal to the Emperor!" What Emperor would that be? We've since discovered in the episode "Rightful Heir" that there is no Emperor in the Klingon Empire, and hasn't been for centuries. Rather, it is governed by the Chancellor.

Great Moment :

Worf's discommendation.

Body Count :

Kurn and a Klingon assassin are injured, but nobody dies.

Factoid :

This was the first ever Trek episode to show us the Klingon home world.

Plotline

When a powerful traitor is uncovered in the Klingon high council, Worf must make the ultimate sacrifice for the good of the Empire.